Model Card | Zyeon UI

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status="ready" — the full sheet. Five benchmarks carry a baseline, so the Score / vs Northwind 3.5 toggle appears: switch it and the bars become signed distances around a centre line, sharing ONE scale. "Hallucination rate" and "First token latency" are lower-is-better, so −1.7 reads as a win and +0.11 as a regression. The price block does the cached-read discount and the per-request estimate itself.

Northwind 4 Large

Northwind AInorthwind-4-large-2026-02

The general-purpose flagship: long-context reasoning, tool use and vision, with prompt caching for repeated system prompts.

Context: 200,000 tokens
Max output: 32,000 tokens
Knowledge: Nov 2025
Released: Feb 18, 2026

Visionsupported
Tool usesupported
JSON modesupported
Prompt cachingsupported
Reasoningsupported
Audiobetain beta
Fine-tuningnot supported

Price per 1M tokens

Input$3.00

Output$15.00

Cached input$0.3090% off

≈ $0.108 per request at 30K in / 1.2K out

Benchmarks

MMLU-Pro82.4%

Baseline Northwind 3.5 · 74.1%

5-shot, chain-of-thought

SWE-bench Verified61.8%

Baseline Northwind 3.5 · 49.2%

MATH-50091.2%

Baseline Northwind 3.5 · 89.9%

Hallucination rate2.1%

Baseline Northwind 3.5 · 3.8%

First token latency0.4 s

Baseline Northwind 3.5 · 0.3 s

p50, us-east, 4K prompt

Model docs

lifecycle='deprecated' — a notice, not a strikethrough: what still works, when it stops, and who takes over. The successor button is only rendered because onSelectReplacement was passed; it sets the same current-model state as the card above.

Northwind 3.5 Turbo

Northwind AInorthwind-3-5-turbo

Deprecated

The previous generation's cheap workhorse. Kept alive for pipelines that are still pinned to it.

Deprecated. Requests keep working until the sunset date, then return 410. Sunsets Nov 30, 2026.

Successor: Northwind 4 Mini

Context: 32,000 tokens
Max output: 4,096 tokens
Knowledge: Aug 2024

Tool usesupported
JSON modesupported
Visionnot supported
Prompt cachingnot supported

Price per 1M tokens

Input$0.50

Output$1.50

Benchmarks

MMLU-Pro61.3%

SWE-bench Verified18.4%

Model docs

lifecycle='retired' — the model no longer answers. The action stays focusable but is aria-disabled and described by the notice above it (a native `disabled` would drop it out of the tab order, so a keyboard reader would never hear why). Clicking it is a no-op; the successor button is the way out.

Northwind 2 Instruct

Northwind AInorthwind-2-instruct

Retired

Retired. This model no longer accepts requests. Retired Jan 15, 2026.

Successor: Northwind 4 Mini

Context: 8,192 tokens
Max output: 2,048 tokens
Knowledge: Apr 2023

JSON modenot supported
Tool usenot supported

lifecycle='preview', priced in EUR, with a capability the component has never heard of ('Grounded search') and a knowledge cutoff written as prose. Unknown ids fall back to a generic mark plus your label; an unparseable date is printed exactly as you wrote it instead of being dropped.

Halcyon 1 Reasoning

Halcyon Labshalcyon-1-reasoning-preview

Preview

A reasoning-first preview. Rates and limits change without notice while it is in preview.

Context: 1,000,000 tokens
Max output: 64,000 tokens
Knowledge: early 2026

Reasoningsupported
Tool usebetain beta
Visionbetain beta
Batch APInot supported
Grounded searchbetain beta

Price per 1M tokens

Input€2.50

Output€12.00

Model docs

Open weights: no pricing, no benchmarks, no docs link. Every block below the header is optional and simply disappears — one component, not a 'lite' variant. Unsupported capabilities still render, struck through, because 'no vision' and 'nobody filled that in' are different answers.

Beacon 8B Instruct

Self-hostedbeacon-8b-instruct

Runs on one GPU. Billed by the hour you rent, not by the token you send.

Context: 128,000 tokens
Max output: 8,192 tokens
Knowledge: Mar 2025

Tool usesupported
JSON modesupported
Visionnot supported

Layout edge case: a 70-character name, a 60-character id and a $0.075/Mtok rate. wrap-anywhere + min-w-0 keep the long strings inside the column, the money formatter keeps three decimals instead of rounding to $0.08, a score of 104 on a scale of 100 clamps the bar but prints the real number, and the row without a baseline says so instead of drawing an empty bar.

Internal Platform Evaluation Checkpoint 2026-03-11 · RC4 (quantized)

Platform Research · Applied Evaluation Grouporg-internal-platform-eval-checkpoint-2026-03-11-rc4-quantized

Context: 262,144 tokens
Max output: 16,384 tokens
Knowledge: Jan 31, 2026

Tool usesupported
Structured planningbetain beta
Visionnot supported

Price per 1M tokens

Input$0.075

Output$0.30

Cached input$0.007590% off

Benchmarks

Internal suite (relative to RC3)104 pts

Regression pack88.5%

Baseline RC3 · 90.2%

defaultBenchmarkView='delta' with nine seeded rows: the card opens on the comparison, the five chart tokens cycle, and every bar is measured against the largest absolute delta on the card so a 0.4-point win never looks like a 13-point one.

Northwind 4 Large · full eval sheet

Northwind AInorthwind-4-large-eval

Context: 200,000 tokens

Reasoningsupported
Tool usesupported

Benchmarks

ARC-Challenge+5.2%

81.3% vs 76.1% · Northwind 3.5

GPQA Diamond+11.5%

63.4% vs 51.9% · Northwind 3.5

HumanEval++6.7%

56.9% vs 50.2% · Northwind 3.5

IFEval+0.2%

76% vs 75.8% · Northwind 3.5

LiveBench Reasoning−3.2%

81.9% vs 85.1% · Northwind 3.5

MGSM+8.3%

74.9% vs 66.6% · Northwind 3.5

MMMU+9.1%

50.7% vs 41.6% · Northwind 3.5

TAU-bench Retail+1.7%

45.7% vs 44% · Northwind 3.5

BFCL Tool Use+7.4%

65.1% vs 57.7% · Northwind 3.5

status='loading' — the skeleton keeps the real card's shape (header, specs, chips, price block, bars) so the layout doesn't jump when the data lands. It pulses, unless you asked for reduced motion.

status='empty' — no model chosen yet. This is the envelope's state, not the model's: it says what to do next rather than apologising.

No model selected

Pick a model to see its context window, price per million tokens and benchmarks.

status='error' — the spec sheet failed to load, which is a different failure from a retired model. Try again is wired to this demo's counter.

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